env: Relocate env drivers if manual reloc is required

Relocate env drivers if manual relocation is enabled. This
patch fixes the issue of u-boot hang incase if env is
present in any of the flash devices.

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/environment.h b/include/environment.h
index 1b52353..2bd0ad1 100644
--- a/include/environment.h
+++ b/include/environment.h
@@ -314,6 +314,11 @@
  */
 int env_save(void);
 
+/**
+ * env_fix_drivers() - Updates envdriver as per relocation
+ */
+void env_fix_drivers(void);
+
 void eth_parse_enetaddr(const char *addr, uint8_t *enetaddr);
 int eth_env_get_enetaddr(const char *name, uint8_t *enetaddr);
 int eth_env_set_enetaddr(const char *name, const uint8_t *enetaddr);